Dorsal aspect of left hand and fingers

Extensor tendons

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Image #111-1
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Dorsal aspect of left hand and fingers
Extensor tendons
1 . Upper pointer: Insertion of extensor expansion into base of terminal phalanx Lower pointer: Collateral parts of extensor expansion (the lumbrical and interosseous muscles insert into these proximally (3) and the collateral parts of the tendon of the common extensor digitorum insert into these dorsally opposite the proximal interphalangeal joint)
2 . Central part of tendon of common extensor digitorum muscle (upper pointer indicates insertion on base of middle phalanx)
3 . Extensor expansion (insertion of lumbrical and interosseous muscles)
4 . Position of metacarpophalangeal joint (covered by transverse fibers of extensor expansion)
5 . Junctural tendon
6 . Abductor digiti minimi muscle
7 . Dorsal interosseous muscles II-V
8 . Extensor digiti minimi proper muscle (tendon of insertion)
9 . Body of nail
10 . Root of nail
11 . Lunula of nail
12 . Vallum of nail
13 . Position of distal interphalangeal joint
14 . Position of proximal interphalangeal joint
15 . Ligament of digital sheath
16 . Extensor expansion of thumb
17 . Adductor pollicis muscle (insertion)
18 . Dorsal interosseous muscle I
19 . Extensor pollicis longus muscle (tendon of insertion)
20 . Extensor indicis muscle (tendon of insertion)
21 . Common extensor digitorum muscle (tendons of insertion)